Baryon spectroscopy in reactions with 10 Hz pion beams at J-PARC

Sako, Hiroyuki   ; Hasegawa, Shoichi   ; Hosomi, Kenji  ; Ichikawa, Yudai   ; Imai, Kenichi; Hicks, K.*; Ahn, J. K.*; Kim, S. H.*; Lee, J. W.*; Hwang, S. H.*

Although baryon resonances have been studied for a long time, our knowledge on their properties are still limited. Recently a Dynamical-Couple Channel (DCC) model shows there are significant contributions of reactions to these baryon resonances. However, there are only 240 thousand events of reaction data measured in 1970's. Thus, we proposed an experiment E45 to study baryon resonances in reaction utilizing Hz beams at J-PARC. We aim at clarifying most of baryon mass levels. We measure these reactions in a large acceptance Time Projection Chamber inside a Helmholtz dipole magnet. We will measure these reactions in small momentum steps over a large beam momentum range and perform partial wave analysis to extract properties of each resonance. In this presentation, we will show the experimental design, expected results in simulations, and the status of the detectors.